line_ids = client["account.invoice.line"].search([("invoice_id.type", "in", ["out_invoice", "out_refund"]), ("margin", "=", 0.0),("purchase_price", "!=", 0.0)])
lines = client ["account.invoice.line"].browse (line_ids)
for line in lines:
	tmp_margin = line.price_subtotal (line.purchase_price* line.quantity)
	sign-1 if line.invoice_id.type in ["in_refund", "out_refund"] else 1
	line.write(
		{
			"margin": tmp_margin,
			"margin_signed": tmp_margin * sign,
			"margin_percent": (
				tmp_margin / line.price_subtotal * 100.0
				if line.price_subtotal
				else 0.0
			),
		}
	)